/Engine/Source/Runtime/CoreUObject/Public/Serialization/BulkDataRegistry.h
Report that a BulkData is leaving memory and its in-memory payload (if it had one) is no longer available.
void OnExitMemory ( const [UE::Serialization::FEditorBulkData](API\Runtime\CoreUObject\Serialization\FEditorBulkData) & BulkData )